17 research outputs found
Morphometry of the Pelvic Ring in Definition of Biomechanical Factors Influencing the Type of Pelvic Fracture
The aim of the study was to supplement data on pelvic morphology and structural geometry. Using these data, a mathematical and biomechanical model was constructed. The research was divided into two parts. The first part comprised radiogrammetric analysis of pelvic morphology and geometry based on 60 AP x-rays of male and female pelvises. The spatial definition of the pelvis was given by three transverse and one sagittal diameter. Transverse diameters were measured at the level of iliac wings, at the narrowest supraacetabular portion and on the line passing through the center of both femoral heads. The fourth diameter was the height of the pelvis. Geometric properties and structure of pelvic bones and position of muscles in relation to bone elements of the pelvis were analyzed in the second part. Knowing geometric dimensions of the pelvis and the body weight, it is possible to calculate the magnitude of gravitational forces acting upon certain pelvic portions. This biomechanical model serves for simulation of operative methods of fixation and allows search for the optimal solution, which is stable enough to withstand all the forces acting upon fragments of a fractured pelvic ring
Analysis of Muscle Forces Acting on Fragments in Pelvic Fractures
CT was used in 50 adult pelvic fractures to determine the size and the position of relevant muscles with regard to bony elements in order to calculate muscle forces acting upon certain pelvic portions. Muscle length was measured to calculate muscle volume and physiological muscle cross-section. Among others, the size and direction of muscle forces were calculated for iliac, pubic and ischiadic fractures. The strongest muscle acting in iliac fractures is m. gluteus medius. The strongest upward pulling of iliac bone fragments is exerted by the erector muscles, while the major anterior, medial and downward pulling is performed by the iliopsoas muscle. In pubic bone fractures, eight muscles push bone fragments downward, the strongest among them being m. adductor magnus. Two muscles pull them upwards: m.rectus abdominis and m. obliquus externus. Nine muscles are responsible for downward displacement of bone fragments in ischiadic fractures, but the strongest is m. semitendinosus. Calculation of moments of muscle forces acting upon bone fragments using CT of pelvic fractures gives additional data for planning of optimal operative treatment that can guarantee stable fixation in individual patients
Retrospective Clinical Analysis of Free Conjunctival Autograft in Treatment of Pterygia
The paper is a clinical retrospective analysis of free conjunctival autograft in treatment of pterygia. In period from
1998 until 2006, 47 patients with pterygia were operated using free conjunctival autograft. There were 19 female and 38
male, average age 61 years. In the majority of patients (39/47) it was a primary pterygia. Eight patients were on topical
antiglaucoma therapy. Free autograft was taken from superotemporal conjunctiva. Introduction of a single nylon suture
to mark the epithelial side of the graft as well as the use of running 10ā0 nylon suture for the graft that stays in up to two
months, were our modifications of the standard technique. The mean follow-up was 18.79.8 months. Free conjunctival
autograft was successfully taken in all patients. Four of them experienced transient graft edema. In glaucoma patients,
delayed healing of the cornea, conjunctival harvest area and the graft was noted. The best corrected visual acuity was improved
in all patients, from 1ā3 Snellen lines. Recurrence of the pterygium was noted in three patients, two of them already
with recurrent pterygium. Free conjunctival graft is a safe and effective method of pterygium surgery that produces
only few complications and has low recurrence rate. We found useful switch from topical to systemic antiglaucoma therapy
as well as adjunctive use of autologous serum drops in promoting and accelerating healing in glaucoma patient
Retrospective Analysis of Reconstruction Techniques After Periocular Basalioma Excision
The paper presents our approach to reconstruction after periocular basalioma (pBCC) excision, especially of large
lower lid (LL) and medial canthal (MC) pBCC. Retrospective analysis of data of 123 patients with pBCC, confirmed on
histologic examination (HE), operated in period from 1998 to 2006, was performed. Oncologic safety margins of 3 mm
were marked after local anesthesia was administered. Reconstruction was done in time of surgery. In pBCC away from a
lid margin, adjacent myocutaneous flaps were used. For lid margin involving (LM) pBCC, size of 10 mm and less in horizontal
diameter (HD), full-thickness lid excision was performed, combined with lateral canthotomy and/or Tenzel or
McGregor flap. When size of LM pBCC was more than 10 mm in HD and it was on a LL, ipsilateral upper lid (UL)
tarsoconjunctival (TC) graft combined with single pedicle transposition myocutaneous flap were used. The same size of
LM pBCC on a UL required ipsilateral full-thickness LL āswitchā flap and/or contralateral LL HĆ¼bner graft. In MC
pBCC combined approach was used. The follow-up was up to 5 years. The 19 patients (15.4%) had positive tumor margin
on HE. Five of them refused further surgery, but only two had recurrence. The rest of 121 patients had no recurrence during
follow-up. In 5/14 patients, who underwent additional surgery, no tumor cells were found on HE. The 10/123 patients
(8.1%) had complications. The imperative of our approach to reconstruction after pBCC was good functional and
cosmetic result, avoiding prolonged lid closure. Accordingly, in large LL LMpBCC we used ipsilateral UL TC graft combined
with single pedicle transposition myocutaneous flap. In MC pBCC combined approach was mandatory
Analysis of Muscle Forces Acting on Fragments in Pelvic Fractures
CT was used in 50 adult pelvic fractures to determine the size and the position of relevant muscles with regard to bony elements in order to calculate muscle forces acting upon certain pelvic portions. Muscle length was measured to calculate muscle volume and physiological muscle cross-section. Among others, the size and direction of muscle forces were calculated for iliac, pubic and ischiadic fractures. The strongest muscle acting in iliac fractures is m. gluteus medius. The strongest upward pulling of iliac bone fragments is exerted by the erector muscles, while the major anterior, medial and downward pulling is performed by the iliopsoas muscle. In pubic bone fractures, eight muscles push bone fragments downward, the strongest among them being m. adductor magnus. Two muscles pull them upwards: m.rectus abdominis and m. obliquus externus. Nine muscles are responsible for downward displacement of bone fragments in ischiadic fractures, but the strongest is m. semitendinosus. Calculation of moments of muscle forces acting upon bone fragments using CT of pelvic fractures gives additional data for planning of optimal operative treatment that can guarantee stable fixation in individual patients
Modified Operative Technique for Involutional Lower Lid Entropion
The paper presents a modified operative technique for involutional lower lid entropion. The prospective noncomparative
study of 101 lower eyelids of 88 patients undergoing surgery for involutional lower lid entropion was conducted
in period from September 2005 until March 2012. Indication for the surgery was entropion, previously untreated, with
moderate to severe horizontal lid laxity and no clinically relevant medial and lateral canthal tendon laxity. The operative
technique is our modification of Quickert and Jones procedures. Photo was taken preoperatively and one month after
surgery. Clinical follow-up was at 7th postoperative day, one month and six months after surgery and in case of the recurrence.
Long-term follow-up was obtained via telephone interviews. There were 44 male (50%) and 44 female (50%) patients
included in the study. The age of patients was in average 73.27Ā±8.1 years (range 53ā90 years). Early postoperative
complication was localized lid swelling found in two patients starting 4ā6 weeks postoperatively at the area of absorbable
suture. It resolved spontaneously in two and three weeks respectively. There was recurrence of entropion in 11 eyelids
(10.89%) of 10 patients. The mean interval between primary surgery and the recurrence was 17.45Ā±14.84 months (range
4ā48 months). In these eyelids Jones procedure was performed. However in four eyelids of four patients from the recurrent
group an additional surgery needed to be performed after 6, 12, 12 and 17 months respectively. Our modification of
surgical treatment for involutional lower lid entropion was effective in 89.11% of eyelids. Complications of the procedure
were scarce
Painless Acanthamoeba Keratitis in a Soft Contact Lens Wearer ā Case Report
Aim of our paper is to present a case of painless Acanthamoeba keratitis in a soft contact lens wearer. A 17-year-old male, highly myopic, prolonged soft contact lens wearer, presented to us with painless red watery right eye having remarkably diminished vision. Last six weeks he was treated elsewhere for the microbial keratitis with no improvement. No pain was reported and on the direct questionnaire about it he denied it. There was marked mixed conjunctival and ciliary injection. A central stromal opacity with a pronounced surrounding corneal ring of inflammatory infiltration and epithelial defect was seen on biomicroscopy of the right eye. Circular pannus was already formed reaching epithelial defect overlying corneal ring infiltrate. Acanthamoeba spp in the corneal sample was confirmed. Prolonged therapy with 0.02% chlorhexidine digluconate solution combined with 0.1% hexamidine solution resulted in corneal healing left with a large central dense stromal opacity with circular pannus reaching peripheral third of the cornea but with very thin blood vessels and the best corrected visual acuity of 0.1 tested on Snellen chart. In conclusion, even in a lack of typical symptom for Acanthamoeba keratitis such as pain, this amoeba should be ruled out especially in a soft contact lens wearer
Cross-Sectional Study of Ocular Optical Components Interactions in Emmetropes
Purpose of the paper was to evaluate ocular optical components (OOC) interactions in a large number of emmetropes.
A cross-sectional study of 1,000 emmetropes, aged from 18ā40 years, has been conducted. Complete ophthalmological examination,
corneal radius (CR) measurement, keratometry and echobiometry of both eyes were performed. The highest
correlation of OOC was that of axial length (Ax) with vitreal body (CV) on both eyes (r=0.79 for the right eye (RE); r=0.81
for the left eye (LE)). The axial length had a positive correlation with the anterior chamber depth (ACD) on both eyes as
well, but the coefficient was very low (r=0.29 for the RE; r=0.32 for the LE). The only negative correlation Ax had on both
eyes was with the lens (L) (r=ā0.17 for the RE; r=ā0.19 for the LE). Keratometry of the horizontal (K1) and vertical meridian
(K2) showed a negative correlation with CV and Ax on both eyes (for K1 r=ā0.64 for CV, r=ā0.54 for Ax; for K2
r=ā0.67 for CV, r=ā0.68 for Ax). CR had a positive correlation with Ax (r=0.74) and CV (r=0.79). It showed a negative
correlation with L (r=ā0.58). CV had a high, positive correlation with Ax (r=0.72 for the RE; r=0.75 for the LE). The
correlation with K1 and K2 was negative. Our study showed that the axial length, keratometry, corneal radius, lens thickness
and vitreal body were the most important OOC that correlated with each other following a pattern in our group of
emmetropes. They interacted in such a way that in the subjects with axial length above the average value, the vitreal body
was longer but the lens was thinner and the cornea was of less power. This could explain at least one of the mechanisms
of emmetropization
Painless Acanthamoeba Keratitis in a Soft Contact Lens Wearer ā Case Report
Aim of our paper is to present a case of painless Acanthamoeba keratitis in a soft contact lens wearer. A 17-year-old male, highly myopic, prolonged soft contact lens wearer, presented to us with painless red watery right eye having remarkably diminished vision. Last six weeks he was treated elsewhere for the microbial keratitis with no improvement. No pain was reported and on the direct questionnaire about it he denied it. There was marked mixed conjunctival and ciliary injection. A central stromal opacity with a pronounced surrounding corneal ring of inflammatory infiltration and epithelial defect was seen on biomicroscopy of the right eye. Circular pannus was already formed reaching epithelial defect overlying corneal ring infiltrate. Acanthamoeba spp in the corneal sample was confirmed. Prolonged therapy with 0.02% chlorhexidine digluconate solution combined with 0.1% hexamidine solution resulted in corneal healing left with a large central dense stromal opacity with circular pannus reaching peripheral third of the cornea but with very thin blood vessels and the best corrected visual acuity of 0.1 tested on Snellen chart. In conclusion, even in a lack of typical symptom for Acanthamoeba keratitis such as pain, this amoeba should be ruled out especially in a soft contact lens wearer
Axial vs. Angular Dynamization of Anterior Cervical Fusion Implants
Aim of our study was to compare anterior cervical fusion with fusion augmented with dynamic implants and with the
first generation H-plate. Methods. Patients with radiculopathy and/or myelopathy were included in a prospective cohort
study. Clinical outcome was assessed according to the Nurick, Odom, and SF 36 scales. Rotation and translation of
screws, and quality of fusion (Tribus) were assessed at the 6-week and 4-year follow-up examinations. Neurodecompression
was performed in 81 patients (one-level N=45, two-level N=26 and multi-level N=10) in the period from January
2001 to September 2003. 50 male and 31 female patients were divided into three groups, depending upon type of fusion:
1. Augmented with dynamic implants (N=33), 2. Augmented with H-plate (N=33), and 3. Non-augmented (N=
15), one-level. There were no significant differences in clinical outcomes between the groups. Dynamization was detected
in both augmented groups: axial in the dynamic implant group (mean translation Ā± SD = 2.67 Ā± 0.79 mm), and angular
in the H-plate group (angle of rotation 7.2Ā° Ā± 3.04Ā°). Six-week fusion was significantly better in the dynamic implants and
non-augmented groups, as compared with the H-plate group. Two patients in the H-plate group developed pseudoarthrosis,
7 patients in the dynamic implant group had supradjacent segment heterotopic ossification and two of these
additional ankylosis. Three patients in the non-augmented group had dislodgement of the bone graft with transient
dysphagia in one of them. Our results suggest that selection of implants is not crucial for clinical outcome. Subsidence is
allowed with both fixation systems. Fusion is faster and more effective in the axially dynamized group